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Aquisição de tempos de vida de fosforescência com resolução de fase e sua aplicação ao estudo de relaxações em polímeros

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dc.creator Talhavini M.
dc.creator Atvars T. D. Z.
dc.date 1998
dc.date.accessioned 2013-05-30T11:02:44Z
dc.date.available 2013-05-30T11:02:44Z
dc.date.issued 2013-05-30
dc.identifier http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421998000300015
dc.identifier http://www.doaj.org/doaj?func=openurl&genre=article&issn=01004042&date=1998&volume=21&issue=3&spage=332
dc.identifier.uri http://koha.mediu.edu.my:8181/jspui/handle/123456789/4352
dc.description We describe in this work a simple experimental set up to perform time dependent luminescence experiments in time scales from mili-seconds to seconds, based on the phase resolution of the emission signal. This system is composed by modulation of a continuous light source with an external chopper controlled by a lock-in amplifier. We exemplified the utility of the system in studies of phosphorecence emission using benzophenone dissolved in polystyrene and since the phosphorescence intensity and lifetime are temperature-dependent processes, we also studied polymer relaxation processes in the temperature range from 20 to 400K. A software that drives the spectrofluorimeter and controls both the cryosystem and the lock-in amplifier was developed.
dc.publisher Sociedade Brasileira de Química
dc.source Química Nova
dc.subject phase resolution lifetime determinations
dc.subject benzophenone
dc.subject polymer relaxation processes
dc.title Aquisição de tempos de vida de fosforescência com resolução de fase e sua aplicação ao estudo de relaxações em polímeros


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